Glass options
Nobody takes energy efficiency more seriously than Andersen. That’s why we offer multiple high-performance glass options that make it possible to get Andersen® windows and patio doors that are ENERGY STAR® certified, no matter where you live in the country.
Choosing The Right Glass
Most people can enjoy optimal energy performance and comfort with our standard Low-E/Low-E4® glass offerings. Low-E ('low-emissive') glass reflects heat in the summer and helps keep heat inside in the winter, making this a good choice in climates where both heating and cooling costs are a concern.
Additional glass performance options include SmartSun™ glass that blocks 95% of the sun’s harmful UV rays and PassiveSun™ glass that brings the heat from sunlight into your home. Check with your Andersen dealer for glass options that make Andersen products ENERGY STAR® certified in your area.
Glass Performance Options
Low-E / Low-E4® Glass
Most people can enjoy optimal energy performance and comfort with Low-E/Low-E4® glass. Low-E glass reflects heat in the summer and helps keep heat inside in the winter, making this a good choice in climates where both heating and cooling costs are a concern.
Ideal for: All Climates
Available on: Low-E glass is available on all Andersen products.
SmartSun™ Glass
SmartSun™ glass gives you the benefits of Low-E glass, plus it helps shield your home from the sun’s heat and filters out 95% of harmful UV rays while letting sunlight shine through.
Ideal for: All Climates
Available on: SmartSun™ glass is available on all Andersen® products.
Sun Glass
Sun glass offers outstanding thermal performance with a subtle tint that blocks out even more heat from the sun.
Ideal for: Southern Climates
Available on: E-Series, A-Series, 400 Series, 200 Series and 100 Series products.
PassiveSun® Glass
If you live in a cold climate, PassiveSun® glass allows the sun to heat your home.
Ideal for: Northern Climates
Available on: PassiveSun® glass is available on all Andersen® products.
Energy performance details
| Glass Option | U-factor How well a product prevents heat from escaping. |
Solar heat gain coefficient (SHGC) How well a product blocks heat caused by sunlight. |
Visible light transmittance (VLT) How much visible light comes through a product. |
UV protection How well a product blocks ultraviolet rays. |
|---|---|---|---|---|
| SmartSun™ | ||||
| SmartSun™ with HeatLock™ Coating | ||||
| Low‑E4® / Low‑E | ||||
| Low‑E4® with HeatLock™ Coating | ||||
| Sun | ||||
| PassiveSun® | ||||
| PassiveSun® with HeatLock® Coating | ||||
| Triple‑Pane (with Low‑E coatings on two surfaces) | ||||
| Clear Dual‑Pane |
Additional Options
More details
(Opens in a new tab)Entry doors info sheet
(Opens in a new tab)Additional glass options info sheet
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We’ve got the answers to your frequently asked HeatLock® Glass questions.